American National Standards Institute, American National Standards Institute, Canadian Standard, Canadian Standard, Institute of Electrical and Electronics Engineers (Piscattaway, E. U., & Institute of Electrical and Electronics Engineers (Piscattaway, E. U. (1975). Graphic symbols for electrical and electronics diagrams: Including reference designation letters. New York, New York: Institute of Electrical and Electronics Engineers.

American National Standards Institute, American National Standards Institute, Canadian Standard, Canadian Standard, Estados Unidos) Institute of Electrical and Electronics Engineers (Piscattaway, and Estados Unidos) Institute of Electrical and Electronics Engineers (Piscattaway. Graphic Symbols for Electrical and Electronics Diagrams: Including Reference Designation Letters. New York, New York: Institute of Electrical and Electronics Engineers, 1975.

American National Standards Institute, et al. Graphic Symbols for Electrical and Electronics Diagrams: Including Reference Designation Letters. New York, New York: Institute of Electrical and Electronics Engineers, 1975.